By O. Ravera (Eds.)
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Extra resources for Biological Aspects of Freshwater Pollution. Proceedings of the Course Held at the Joint Research Centre of the Commission of the European Communities, Ispra, Italy, 5–9 June 1978
Beggiatoa nivea 2. Community of Oscillatoria 2. Community of Sphaerotilus Community of Ulothix zonata trophy) or Osoillatoria or Stigeoclonium tenue Community of Cladophora Fhormidium tilis) (high henthoniown fracta Community of Rhodophyceae spermum monoliforme or (Batraoho- or Lemanea fluvia- or community of Chlorophyceae (Cladophora zonata) VIII. ata^ Batrachospermm vagurrij or Hildenhrandia rivularis) or community of Vaucheria sessilis or Phormidium inundatum IX. Katharobic zone Community of Chlorophyceae tylium plumosa cataractum and (Chloro- Orapamaldia or community of Rhodophyceae (Chantransia ohalyhdea and Hildenhran- dia rivularis or community of encrus ting algae (Chamaesiphon polonicus and various species of Cladothrix) X 1, 2 and 3 are various degrees of impurity within a zone 52 G.
Management of aquatic vegetation with Simazine. Proc . Northeast Weed Sei. S o c , 30: 86-91. D . J . (1977). Distribution of cadmium and lead in a stream ecosystem. Hydrobiologia, 52: 153-158. A . (1974). Use of animal behaviour studies in water toxicology. Gidrobiol. Z h . , 10: 114-120. Fowler, S . W . F . (1967). Moulting of Euphausia pacifica as a possible mechanism for vertical transport of Zinc-65 in the sea. J. Oceanol. , 1: 237-245. Zooplankton Ecology and Pollution Studies 35 Frear, D .
For more information we refer to BICK (1963), SCHWOERBEL (1970) and SLADECEK (1973). Biological Indicators of Water Quality 53 Let us quote, however, the work of CASPERS and co-authors (1960, 1962, 1966a,b, 1967) for their particular, new interpretation of saprobity, based on physiological principles (the classic concept is based on ecological ones). CASPERS departs from the definition of trophism proposed by ELSTER (1958) which describes trophism as "the intensity of organic primary production", to deduce that saprobity is the intensity of the decomposition of dead organic matter.
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